CN104682445B - A kind of more transverters realize grid-connected method from off-network - Google Patents
A kind of more transverters realize grid-connected method from off-network Download PDFInfo
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- CN104682445B CN104682445B CN201310620444.0A CN201310620444A CN104682445B CN 104682445 B CN104682445 B CN 104682445B CN 201310620444 A CN201310620444 A CN 201310620444A CN 104682445 B CN104682445 B CN 104682445B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/40—Synchronising a generator for connection to a network or to another generator
- H02J3/42—Synchronising a generator for connection to a network or to another generator with automatic parallel connection when synchronisation is achieved
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/50—Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications
- Y04S10/52—Outage or fault management, e.g. fault detection or location
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Abstract
The invention provides a kind of more transverters to realize grid-connected method from off-network, and it is mainly included the following steps that successively：S10, controller detect and judge whether power network recovers, if so, step S20 is then performed, if it is not, then return to step S10；S20, controller detect the phase of the output voltage of power network；S30, controller adjust its fixed phase, so that fixed phase and the Phase synchronization of the output voltage of the power network after controller regulation, and controller sends voltage-phase revision directive according to the fixed phase after regulation in the first predetermined period to all transverters, voltage-phase revision directive described in all inverters adjusts the phase of respective output voltage, so that the phase of output voltage of each transverter in the second predetermined period is synchronous with the fixed phase after the regulation；S40, controller adhesive and off-network switch.It is grid-connected that method provided by the invention can be such that the realization of more transverter smooth-goings in parallel is switched to from off-network.
Description
Technical field
The present invention relates to a kind of micro-capacitance sensor field, more particularly to a kind of more transverters to realize grid-connected method from off-network.
Background technology
With the progress of science and technology and the development of society, modern society increasingly increases the demand of electric power.Centralized bulk power grid
Some shortcomings are shown in actual motion, as operating cost is high, is difficult to meet the higher and higher safety and reliability of user
It is required that and micro-capacitance sensor can make up the deficiency of bulk power grid very well.As China's reinforcement intelligent grid enters the stage of all-round construction,
As the micro-capacitance sensor of the important component of intelligent grid, will also be connect in demonstration project, electric automobile electric charging equipment, new energy
Receive, Intelligent resident electricity utilization etc. is more widely used.Micro-capacitance sensor is by power supply, converter, control device and born
The system that lotus collectively constitutes, be one can self-monitoring, operation, protection autonomous system.Micro-capacitance sensor both can be with external electrical
Net is incorporated into the power networks, can also isolated operation（That is off-grid operation）.
So as needed, the transverter in micro-capacitance sensor can be separately operable under grid-connected and off-network pattern.In order to ensure
The normal operation of load, transverter is when carrying out and off-network switching, it is necessary to ensure the smooth-going of output voltage.Although in the prior art
The transverter of separate unit from off-network switch to grid-connected when by electric current and voltage impact it is smaller, still, micro-capacitance sensor usually requires more
Individual energy-storage battery group and multiple transverter parallel connections are with powering load.However, in the prior art, include the more changes of current in parallel
The micro-capacitance sensor of device from off-network switch to grid-connected when, it is generally larger by the impact of electric current and voltage so that the more changes of current in parallel
What device was difficult to smooth out switches to grid-connect mode from off-network.
It is understood that the statement of this part only provides background information related to the present invention, not possible composition or structure
Into so-called prior art.
The content of the invention
The technical problems to be solved by the invention are to be difficult to smooth out when being directed to more transverter parallel connections of prior art
Switch to the defects of grid-connected from off-network, there is provided a kind of more transverters realize grid-connected method from off-network, so that more parallel connections
Being switched to from off-network of can smoothing out of transverter it is grid-connected, and then reduce micro-capacitance sensor and impacted by voltage and electric current.
The technical solution adopted for the present invention to solve the technical problems is to provide a kind of more transverters and realized simultaneously from off-network
The method of net, for more transverters in parallel to be switched into off-network state from simultaneously net state, it mainly includes following step successively
Suddenly：
S10, controller detect and judge whether power network recovers, if so, step S20 is then performed, if it is not, then return to step
S10；
S20, controller detect the phase of the output voltage of power network；
S30, controller adjust its fixed phase, so that the fixed phase after controller regulation and the output electricity of the power network
The Phase synchronization of pressure, and controller sends voltage according to the fixed phase after regulation in the first predetermined period to all transverters
Phase only pupil filter instructs, and voltage-phase revision directive described in all inverters adjusts the phase of respective output voltage, so that respectively
The phase of output voltage of the transverter in the second predetermined period is synchronous with the fixed phase after the regulation；
S40, controller adhesive and off-network switch.
In above-mentioned more transverters realize grid-connected method from off-network, the phase of the respective output voltage of the regulation be by
Transverter changes the frequency of its own output voltage to realize.
In above-mentioned more transverters realize grid-connected method from off-network, step S50 is also included after step S40：Control
Device calculates the average output power of all transverters according to the present output power of every transverter and averagely exported described
Power is sent to each transverter.
In above-mentioned more transverters realize grid-connected method from off-network, also include after step S50：Every transverter
Respective final output power is adjusted according to the present output power of itself and the difference of average output power, so that every is changed
The final output power for flowing device is consistent with the average output power.
In above-mentioned more transverters realize grid-connected method from off-network, the present output power of every transverter is by every
Transverter oneself detection calculates and the present output power of calculating is uploaded into controller.
In above-mentioned more transverters realize grid-connected method from off-network, every transverter oneself adjusts its output voltage
Amplitude and frequency adjust respective final output power.
In above-mentioned more transverters realize grid-connected method from off-network, when in simultaneously increase electricity between off-network switch and power network
The amplitude that pressure collector and voltage collector collect power network output voltage is 220V and the frequency of power network output voltage is 50HZ,
Then judge power system restoration.
In above-mentioned more transverters realize grid-connected method from off-network, in step S30, controller control is all to change
Stream device carries out the phase of the respective output voltage of regulation simultaneously.
In above-mentioned more transverters realize grid-connected method from off-network, in step S30, when certain transverter realize it is defeated
Go out voltage phase it is synchronous with the fixed phase after the regulation when, the transverter to controller send Phase synchronization successfully mark
Will.
In above-mentioned more transverters realize grid-connected method from off-network, the off-network switches successfully mark and the phase
Synchronous Success Flag can be sent to controller by photosignal or message form.
More transverters provided by the invention realize in grid-connected method that it is by first judging whether power network is extensive from off-network
Multiple, then controller first detects the phase of the output voltage of power network after power system restoration, and and then controller is in predetermined period
The fixed phase of its own is adjusted, to change the voltage-phase revision directive that controller issues each transverter, controller control institute
Fixed phase after the regulation of some inverters adjusts the phase of respective output voltage, so that each transverter is predetermined second
The phase of output voltage in cycle is synchronous with the fixed phase after regulation.So last controller can cause it is all
The Phase synchronization of the phase of the output voltage of transverter and the fixed phase of controller with the output voltage of the power network of recovery,
And then all transverters do not change frequency further according to the synchronizing signal of controller, but all transverters are realized according to electricity
The frequency of net adjusts the frequency of respective output voltage, then, controller adhesive and off-network switch.Therefore controller can control
More transverters in parallel switched to from off-network it is grid-connected, and the phase of its output voltage for causing all transverters with electricity
The Phase synchronization of the output voltage of net, it can make being switched to from off-network for more transverters smooth-goings in parallel grid-connected, and then subtract
Few micro-capacitance sensor is impacted in pattern switching by voltage and electric current.
Brief description of the drawings
Fig. 1 is the more transverters circuit block diagram in parallel for forming micro-capacitance sensor；
Fig. 2 is that the more transverters in parallel that one embodiment of the invention provides realize grid-connected flow chart from off-network；
Fig. 3 is that the more transverters in parallel that further embodiment of this invention provides realize grid-connected flow chart from off-network.
Embodiment
In order that technical problem solved by the invention, technical scheme and beneficial effect are more clearly understood, below in conjunction with
Drawings and Examples, the present invention will be described in further detail.It should be appreciated that specific embodiment described herein only to
The present invention is explained, is not intended to limit the present invention.
In the description of the invention, it is to be understood that term " longitudinal direction ", " transverse direction ", " on ", " under ", "front", "rear",
The orientation or position relationship of the instruction such as "left", "right", " vertical ", " level ", " top ", " bottom " " interior ", " outer " is based on accompanying drawing institutes
The orientation or position relationship shown, it is for only for ease of the description present invention and simplifies description, rather than instruction or the dress for implying meaning
Put or element there must be specific orientation, with specific azimuth configuration and operation, therefore it is not intended that to limit of the invention
System.
Grid-connected method is realized from off-network for more transverters the invention provides a kind of, this method is mainly used in micro- electricity
In net, more transverters in parallel are switched into simultaneously net state from off-network state.Referring to Fig. 1, it is the structural frames of micro-capacitance sensor
Figure, micro-capacitance sensor with lower module mainly by being formed：X platforms transverter in parallel（x = 1~N）, x energy-storage battery group（x = 1~N）、
Controller and off-network switch, load and power network.Transverter x DC side electrically connects with corresponding energy-storage battery group；The more changes of current
After device connects with corresponding energy-storage battery, more transverter ACs are in parallel, then more transverters electrically connect with load, and more
Platform transverter is switched by simultaneously off-network（In figure and off-network switch is the switch of three-phase, with corresponding with three phase network）It is electrically connected with power network
Connect.Wherein, transverter, controller, power network can carry out data interaction by data wire.Each transverter will be run by data wire joins
Number etc. sends to controller, controller and sends commands to each transverter by data wire, and operation of power networks parameter can also pass through number
Controller is transferred to according to line, controller is switched on-off by data line traffic control and off-network, to control the company of transverter and power network
Connect and disconnect.
It is provided by the invention a kind of grid-connected method master to be realized from off-network for more transverters referring to shown in Fig. 2 and Fig. 3
Comprise the following steps：
S10, controller detect and judge whether power network recovers, if so, then performing step S20, continue to hold if it is not, then returning
Row step S10；Specifically, when detection determines power system restoration, micro-capacitance sensor needs to start to perform to switch to simultaneously from off-network state
Net state, if power network does not recover, continue to detect and judge whether power network recovers.
S20, controller detect the phase of the output voltage of power network；
S30, controller adjust its fixed phase, so that the fixed phase after controller regulation and the output electricity of the power network
The Phase synchronization of pressure, and controller sends voltage according to the fixed phase after regulation in the first predetermined period to all transverters
Phase only pupil filter instructs, and voltage-phase revision directive described in all inverters adjusts the phase of respective output voltage, so that respectively
The phase of output voltage of the transverter in the second predetermined period is synchronous with the fixed phase after the regulation.Specifically, by
In being usually provided with fixed phase in controller（That is normalized phase）, each transverter includes generally according to what controller was sent
The instruction of fixed phase controls to adjust its output voltage.So after power system restoration, micro-capacitance sensor needs to be changed into transverter
The frequency of the output voltage of its own is adjusted according to mains frequency, so, controller adjusts its fixed phase, adjusts controller
Fixed phase after section and the Phase synchronization of the output voltage of power network recovered, so controller in the first predetermined period to institute
Some transverters send the voltage-phase revision directive of the fixed phase after including regulation, so that all transverters are second
Change the phase of its respective output voltage in predetermined period according to voltage-phase revision directive.I.e. controller is at interval of certain
Time sends voltage-phase revision directive to transverter, and transverter goes the execution completion voltage-phase to repair within the predetermined time
Positive order.For example, the phase of output voltage after power system restoration is 0 degree, then controller by its fixed phase by original 10 degree
0 degree is adjusted to, then, controller is in 20ms（First predetermined period）The instruction of primary voltage phase only pupil filter is inside sent, with order institute
The phase of some each self-corrections of transverter output voltage of itself, each above-mentioned voltage-phase revision directive of inverter is in 5ms
（Second predetermined period）The interior phase adjusted by respective output voltage is 0 degree.
S40, controller adhesive and off-network switch；
Last controller can cause the output voltage of all transverters phase and controller fixed phase it is equal
With the Phase synchronization of the output voltage of the power network of recovery, and then all transverters not further according to controller synchronizing signal change
Frequency, but all transverters are realized according to the frequency of power network to adjust the frequency of respective output voltage.Therefore controller
More transverters in parallel can be controlled to be switched to from off-network grid-connected, and the phase of its output voltage for causing all transverters
Phase synchronization of the position with the output voltage of power network, it can make being switched to simultaneously from off-network for more transverters smooth-goings in parallel
Net, and then reduce micro-capacitance sensor and impacted in pattern switching by voltage and electric current.
Grid-connected handoff procedure is realized from off-network above-mentioned, it is preferable that under the control of the controller, each transverter regulation
The phase of its own output voltage is mainly to change the frequency of its own output voltage by transverter to realize.For example, every
Transverter oneself is according to VF algorithms（I.e. the sagging algorithm of electric voltage frequency, VF algorithms are well known to those skilled in the art）To adjust it
Output frequency, to change the phase of its output.This mode can make each transverter fast and accurately correct the phase of its output voltage
Position.And controller determines the aim parameter of each transverter amendment.
It is shown in Figure 3, in a preferred embodiment of the invention, step S50 is also included after step S40：Controller root
The average output power of all transverters is calculated according to the present output power of every transverter and by the average output power
Send to each transverter, so can understand working condition and remaining change of current of its own in order to controller and each transverter
The working condition of device, and then can be in order to the coordination of progress power output between each transverter.It is highly preferred that step S50 it
Also include afterwards：The present output power of every inverter itself and the difference of average output power are respective final to adjust
Power output, so that the final output power of every transverter is consistent with the average output power.That is each transverter can be with
Realize that power output is consistent, stream exports to realize.What deserves to be explained is the present output power of every transverter can be by it
Oneself detection is calculated, then is uploaded to controller and is calculated by controller the average output power of all transverters,
The present output power of detection every transverter of calculating and the average output work of all transverters can be directly gone by controller
Rate.Preferably, the present output power of every transverter by every transverter oneself detect calculate and it is current by what is be calculated
Power output is uploaded to controller, can so improve and realize grid-connected switching efficiency from off-network or reduce from off-network and cut
The impact of load is influenceed when shifting to grid-connected.Preferably simultaneously, every transverter oneself adjusts the amplitude and frequency of its output voltage
Rate adjusts respective final output power to realize, i.e., each transverter has self adjustment function, and passes through to adjust and each export
The amplitude and frequency of voltage also can both ensure that quick pattern switching and can reduces pattern to adjust the mode of final output power
Switching the impact on load influences.
What deserves to be explained is the detection judges whether power network recovers to have a variety of methods, it is preferable that when in simultaneously off-network
Increase voltage collector between switch and power network, while it is 220V and electricity that voltage collector, which collects the amplitude of power network output voltage,
The frequency of net output voltage is 50HZ, then judges power system restoration..This mode can fast and accurately detect whether judge power network
Recover, fast and accurately to judge whether to need to switch to grid-connect mode from off-network.
Switching method provided by the invention is described below further in conjunction with preferred embodiment shown in Fig. 3：
S100, controller detect and judge whether power network recovers, so that system judges whether to need to be switched to simultaneously by off-network
Net, if power system restoration, next step is performed, if it is not, then continuing executing with this step.
S200, controller detect the phase of the output voltage of power network；
Fixed phase in S300, controller adjustment control device, so that fixed phase and the electricity after controller regulation
The Phase synchronization of the output voltage of net；For example, controller adjusts the phase of its reference voltage to 0 degree by 30 degree（Recover
The phase of power network output voltage is 0 degree）；Refer to moreover, controller sends voltage-phase amendment in 50ms to all transverters
Order, voltage-phase revision directive described in all inverters adjust the phase of respective output voltage, so that each transverter is used
The phase of respective output voltage is adjusted to 0 degree by 10ms time, meanwhile, when certain transverter realizes the phase of output voltage
When position is synchronous with the fixed phase after the regulation, the transverter sends phase by photosignal or message form to controller
Synchronous Success Flag.
S400, controller are after the Phase synchronization Success Flag that all transverter transmission come is received, controller control
Adhesive and off-network switch, so that transverter electrically connects with power network.
S500, the detection of every transverter oneself calculate respective present output power and current by what is be each calculated
Power output is uploaded to controller, and controller calculates being averaged for all transverters according to the present output power of every transverter
Power output simultaneously sends the average output power to each transverter.
S600, the present output power of every inverter itself and average output power difference are respective to adjust
Final output power, so that the final output power of every transverter is consistent with the average output power.
In above-mentioned steps S30：Controller can several times by its fixed phase adjust to output during power system restoration
The Phase synchronization of voltage, for example, the original fixed phase of controller is 50 degree, the phase of output voltage during power system restoration is 0
Spend, then controller disposably can be adjusted to 0 degree in 50ms by 50 degree, and controller can also every time will by 5 regulations
The phase of its reference voltage reduces 10 degree, until its fixed phase is adjusted to 0 degree by 50 degree after 50ms.Meanwhile controller can
Its fixed phase is adjusted with one side, while controlling to adjust the phase of the output voltage of transverter towards close to 0 degree（During power system restoration
The phase of output voltage）It is modified；Controller can also first by its fixed phase amendment to after 0 degree, then in a predetermined order according to
The secondary phase for going to control each transverter to adjust respective output voltage；Controller can also be first by its fixed phase amendment to 0 degree
Afterwards, then control each transverter while adjust the phase of respective output voltage.Preferably, controller progressively adjusts its fixed phase
To with after the Phase synchronization of output voltage during power system restoration（Its fixed phase is adjusted several times）, controller control is all to change
Stream device carries out the phase of the respective output voltage of regulation simultaneously.For example, controller in 50ms points 5 times by its fixed phase by
50 degree are adjusted to 0 degree, after the phase adjusted of controller is extremely consistent with the phase of output voltage during power system restoration, controller control
Make all transverters while adjust the phase of respective output voltage, each transverter is output it voltage in 10ms
Phase adjusted is 0 degree, can so ensure that the impact that more transverters in parallel are reduced in switching on load influences.It is worth saying
Bright, controller sends voltage-phase revision directive in the first predetermined period to each transverter, and each transverter is pre- second
Performed in fixed cycle and complete the voltage-phase revision directive, still, it is generally the case that the second predetermined period week more predetermined than first
Phase is short, i.e., the interval time of the execution time ratio control device transmitting order to lower levels of each transverter is short, to negative when can so reduce switching
The influence of load.For example, controller in 50ms to 5 transverters（Assuming that micro-capacitance sensor includes 5 transverters in parallel altogether）Hair
Power transmission pressure phase only pupil filter instruction, every transverter receive realized in 5ms after the instruction phase of output voltage with it is described
Fixed phase after regulation is synchronous.
In above-described embodiment, when certain transverter realizes that the phase of output voltage and the fixed phase after regulation are same
During step, the transverter sends Phase synchronization Success Flag to controller.Controller and whole power network can so be made quick and precisely
Implementation pattern switching.Phase synchronization Success Flag can be sent by diversified forms to controller, for example, off-network switches successfully mark
Will and Phase synchronization Success Flag can be sent to controller, which by photosignal or message can fast and accurately send phase
Bit synchronization Success Flag.
In summary, more transverters provided by the invention realize grid-connected method from off-network while have advantages below：
1）It is grid-connected can to realize that more transverters in parallel switch to from off-network；
2）It can ensure that impact of the more transverters in parallel in switching by voltage and current is smaller；
3）Stream output is realized after more transverter switchings in parallel can be ensured.
In the description of this specification, reference term " one embodiment ", " some embodiments ", " example ", " specifically show
The description of example " or " some examples " etc. means specific features, structure, material or the spy for combining the embodiment or example description
Point is contained at least one embodiment or example of the present invention.In this manual, to the schematic representation of above-mentioned term not
Necessarily refer to identical embodiment or example.Moreover, specific features, structure, material or the feature of description can be any
One or more embodiments or example in combine in an appropriate manner.
In the description of the invention, unless otherwise prescribed with limit, it is necessary to explanation, term " installation ", " connected ",
" connection " should be interpreted broadly, for example, it may be mechanical connection or electrical connection or the connection of two element internals, can
To be to be joined directly together, can also be indirectly connected by intermediary, for the ordinary skill in the art, can basis
Concrete condition understands the concrete meaning of above-mentioned term.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all essences in the present invention
All any modification, equivalent and improvement made within refreshing and principle etc., should be included in the scope of the protection.
Claims (7)
1. a kind of more transverters realize grid-connected method from off-network, for more transverters in parallel to be switched from off-network state
To simultaneously net state, it is characterised in that mainly include the following steps that successively：
S10, controller are detected and judge whether power network recovers, if so, then performing step S20, step is continued executing with if it is not, then returning
Rapid S10；
S20, controller detect the phase of the output voltage of power network；
S30, controller adjust its fixed phase, so that the fixed phase after controller regulation and the output voltage of the power network
Phase synchronization, and controller sends voltage-phase according to the fixed phase after regulation in the first predetermined period to all transverters
Revision directive, voltage-phase revision directive described in all inverters adjusts the phase of respective output voltage, so that each change of current
The phase of output voltage of the device in the second predetermined period is synchronous with the fixed phase after the regulation, wherein, the regulation
The phase of respective output voltage is to change the frequency of its own output voltage by transverter to realize；
S40, controller adhesive and off-network switch；
S50, controller calculate the average output power of all transverters according to the present output power of every transverter and incited somebody to action
The average output power is sent to each transverter；
Also include after step S50：The present output power of every inverter itself and the average output power
Difference adjusts respective final output power, so that the final output power of every transverter and the average output power one
Cause.
2. the method as described in claim 1, it is characterised in that the present output power of every transverter by every transverter from
Oneself calculates and the present output power of calculating is uploaded into controller detection.
3. the method as described in claim 1, it is characterised in that every transverter is by oneself adjusting the amplitude of its output voltage
Respective final output power is adjusted with frequency.
4. the method as described in claim 1, it is characterised in that increasing voltage acquisition between power network when being switched in simultaneously off-network
Device, while it is 220V and the frequency of power network output voltage is 50HZ that voltage collector, which collects the amplitude of power network output voltage, then
Judge power system restoration.
5. the method as described in claim 1, it is characterised in that
In step S30, controller controls all transverters to carry out the phase for adjusting respective output voltage simultaneously.
6. the method as described in claim 1 or 5, it is characterised in that in step S30, when certain transverter realizes output electricity
When the phase of pressure is synchronous with the fixed phase after the regulation, the transverter sends Phase synchronization Success Flag to controller.
7. method as claimed in claim 6, it is characterised in that the Phase synchronization Success Flag passes through photosignal or message
Form is sent to controller.
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